RATIONALE: Studying blood samples from cancer patients undergoing pain treatment in the laboratory may help doctors learn more about how pain drugs work in the body. It may also help doctors predict how patients will respond to treatment.

PURPOSE: This research study is looking at fentanyl in patients with cancer.

No known requirement for continued opioid therapy with any fentanyl citrate products after discontinuation of fentanyl citrate therapy

Contacts and Locations

Choosing to participate in a study is an important personal decision. Talk with your doctor and family members or friends about deciding to join a study.
To learn more about this study, you or your doctor may contact the study research staff using the Contacts provided below.
For general information, see Learn About Clinical Studies.

Please refer to this study by its ClinicalTrials.gov identifier: NCT00899951